Resizing Image To Fit Selection Properties

I have figured out how to use the "Paste Into" feature, but I was wondering if there was anyway to have the image properties automatically changed to fit the selection? Dimensions, perspective, etc... As it is now, if the image is too big, it just clips off the excess.

If not, could someone please explain to me the best way to to resize an image and change the perspective to best fit the selection or layer?

Thanks in advance.

*EDIT* Is there any way to view selection properties? Like dimensions and so on?